IMO I would prefer a Bluetooth thermostat that once paired, you don't have to login again. One thing that really annoys me about home "smart" devices is arbitrarily being logged out and having to remember passwords etc. and I don't see a reason I need to be "logged in" to control my thermostat. Also I don't want it to stop working when your servers are down... (had this happen the other day with my garage door opener sigh...) If you want internet connectivity, it should connect to some hub to bridge the Bluetooth to the web account.